/*

 小明帶著N元錢去買醬油。醬油10塊錢一瓶，商家進(jìn)行促銷，

 每買3瓶送1瓶，或者每買5瓶送2瓶。請(qǐng)問(wèn)小明最多可以得到多少瓶醬油。

 */

 #include <stdio.h>  

 int main(void)

 {

    int money=,cnt=,cnt1=,cnt2=;

     scanf("%d",&money);

     cnt=money/;

     cnt1=(cnt/)*;

     cnt2=(cnt-(cnt1/)*)/;

     cnt=cnt+cnt1+cnt2;

     printf("%d",cnt);

     return ;

 }  

 /*20170901打醬油*/

 /*

 小明帶著N元錢去買醬油。醬油10塊錢一瓶，商家進(jìn)行促銷，

 每買3瓶送1瓶，或者每買5瓶送2瓶。請(qǐng)問(wèn)小明最多可以得到多少瓶醬油。

 */

 #include <stdio.h>  

 int main(void)

 {

    int money=,cnt=;

     scanf("%d",&money);

     cnt=money/;

     cnt+=(cnt/)*;

     cnt+=cnt/;

     printf("%d",cnt);

 }  

 /* CCF201709-1 打醬油 */  

 #include <stdio.h>  

 const int ONE = ;

 const int TWO = ;

 const int FIVE = ;

 const int THREE = ;

 const int PRICE = ;  

 int main(void)

 {

     int n, group1, group2, group3;  

     scanf("%d", &n);  

     group1 = n / PRICE / FIVE;

     group2 = (n - group1 * PRICE * FIVE) / PRICE / THREE;

     group3 = (n - group1 * PRICE * FIVE - group2 * PRICE * THREE) / PRICE;  

     printf("%d\n", group1 * (FIVE + TWO) + group2 * (THREE + ONE) + group3);  

     return ;

 }